Used in agricultural and environmental research to quantify nitrate reductase enzyme activity in soil samples, helping assess microbial activity and nitrogen cycling efficiency. Enables researchers to evaluate the impact of fertilizers, soil amendments, or environmental changes on nitrogen transformation processes. Widely applied in studies focused on sustainable farming, soil health monitoring, and reducing nitrate leaching into ecosystems. The ELISA format offers high sensitivity and specificity, making it suitable for detecting low levels of NarG protein in complex soil matrices.